<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>

    <script>
        let arr = new Array(10);
        arr.fill('早', 1, 3)
        console.log(arr); // (10) ["早", "早", "早", "早", "早", "早", "早", "早", "早", "早"]
    </script>

</body>

</html>